Core structure for dynamos



W. W. DEAN.

CORE STRUCTURE FOR DYNAMOS.

APPLICATION FILED AUG-4. I916.

Patented Jan. 25,1921.

' To all whom it may concern:

UNITED STATES PATENT OFFICE;

WILLIAM WARRENDEAN, 0E RocEEs'rEE, NEw YORK, ASSIGNOR To SPLITDORF ELECTRICAL comrANY, or NEWARK, NEW JERSEY, A CORPORATIQN OF NEW JERSEY.

CORE STRUCTURE FOR DYNAMICS.

Specification of Letters Patent. Pat t d Jan 1921 o I Application filed'August 4,1916. Serial No. 113,118.

Be it known that I, WILLIAM W. DEAN, a citizen of the United States, residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Core Structures for Dynamos, of which the following is arspecification, reference being had to the accompanying drawing.

The invention relates to improvements in core structures for dynamos and more particularly to the core structure for a stationary current generating coil used in connection with a rotor.

An object of the invention is to providea coil supporting structure including a core and pole pieces wherein the core is' in extended contact with the pole pieces whereby maximum efficiency in the travel of the flux through the pole pieces and the core is obtained.

In the drawings, which show by way of illustration, one embodiment of the invention Figure 1 is a top plan view of a generating coil having a core and pole pieces and embodying my improved means for attaching the core to the pole pieces; I

Fig. 2 is a View showing more or less diagrammatically in end elevation a dynamo having a rotor and pole pieces attached by my improved means to the core of the generating coil;

Fig. 3 is a side view of one of the pole pieces, the generating coil and the core, the pole piece being broken away to show an end view of the core; and

Fig.4. is a sectional view on the line 4-4 ()f Fi'g. 3. j

The invention is shown as applied to a type of dynamo which is provided with upstanding pole pieces 1 and 2 adapted to receive the flux from the rotor, which for the sake of illustration, is shown as a rotating magnet having N and S poles. Positioned across the top of the pole pieces 1 and 2 is a core 3 carrying the generating windings 4' moved and replaced if desired. The idea of V removing the core and the winding carried thereby from the pole pieces is not new with me but in all prior structures so far as I am aware, it has been necessary to accurately mill or otherwise machine the joints 5 and 6 between the core and the pole pieces so as to secure the best possible path for the mag? netic flux. A poor joint at this point decreases greatly the efliciency of the dynamo. The size of the core is limited by the commerclal requirements as to the size of the dynamo. I

The thickness of the core is indicated at the line 7 on thedrawing. The extending portions 8 and 9 of the core are of the same thickness or width and heretofore it has been required to employ very accurate fitting of these projecting portions to the pole pieces 1n order to insure efliciency.

The present invention consists of the shapln'g of the ends of the core. In Fig. 4

of the drawing, I have shown the core 3 in plan View and this core is extended laterally at 10 and 11 forming an H-shaped core. The core is made up preferably of laminat ons having these laterally extending portions 10 and 11 which are of considerably greater width than the central portion of the core about which the windings are placed.

About these H -'shaped laminations is placed suitable insulation, indicated at 12 on the drawing, on which the wire is wound in the usual manner.

The pole pieces are provided with upstanding portions 13 and 14 of sufficient depth to receive the ends of the core. The ends of the pole "pieces are recessed at 15 and in these recessed portions are set the ends 10 and 11 of the core, thus forming the joints 5 and 6. By this arrangement a relatively great area of contact is secured between these ends 10 and 11 of the core and the upper ends of the pole pieces 1 and 2. This core may be secured to the pole pieces in any suitable way. I

It is obvious that minor changes in the details of construction may be made without departing from the spirit of the invention as set forth in the appended claims.

' aving thus described my invention, what I claim as new and desire to secure by Letters Patent, is 2- 1. In an ignition dynamo a" stationary generating coil; a core therefor having ends projecting from the coil, pole pieces for said core, said core having its ends extended laterally forming an H-shaped core said pole pieces receiving the extended ends of the core and being substantially the same 5 depth as the length of the ends 0f the core.

2. In'an ignition dynamo a stationary generating coil, a core therefor having ends projecting from the coil, pole pieces for said core, said pole pieces having recesses ex- 10 tending across their inner faces at the upper ends thereof, said core having its ends later ally extended and adapted to rest in said recesses and extend from side to side of said pole pieces.

In testimony whereof I hereunto afiix my 15 signature in the presence of two Witnesses.

WILLIAM WARREN DEAN. WVitnesses:

GEORGE R. CLOSE, HARRY B. WEVIRS. 

